Give reasons
(i) Uniforms of fireman have coating of melamine plastic.
(ii) Bakelite is used for making electrical switches
(iii)Plastic is used in place of metals.
Answers
Answer:
(i) Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. It is used to make floor tiles, kitchenware and fire resistant fabrics. It is also used for making uniforms of fire-men.
(ii) Bakelite is used for making handles of frying pans. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity
(iii) When considering most industrial applications, it is often both extremely time- and cost-consuming to construct multiple different metal parts that are needed to make up a single large material or machine component.
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Answer:
(i) Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. It is used to make floor tiles, kitchenware and fire resistant fabrics. It is also used for making uniforms of fire-men.
(ii) Bakelite is used for making handles of frying pans. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity
(iii) When considering most industrial applications, it is often both extremely time- and cost-consuming to construct multiple different metal parts that are needed to make up a single large material or machine component.